Side wall portion of a retaining wall block



FIG. 1 is a perspective view of a side wall portion of a retaining wall block according to my new design; and,

FIG. 2 is a right side view of the side wall portion depicted in FIG. 1.

The broken lines in the drawings illustrate an embodiment of the structural environment of a retaining wall block and form no part of the design sought to be patented. 

The ornamental design for a side wall portion of a retaining wall block, as shown and described. 